diff --git a/modules/libpref/init/StaticPrefList.h b/modules/libpref/init/StaticPrefList.h
index 972dc1fedd7f..458a79cd080f 100644
--- a/modules/libpref/init/StaticPrefList.h
+++ b/modules/libpref/init/StaticPrefList.h
@@ -1745,11 +1745,17 @@ VARCACHE_PREF(
 // Feature-Policy prefs
 //---------------------------------------------------------------------------
 
+#ifdef NIGHTLY_BUILD
+# define PREF_VALUE true
+#else
+# define PREF_VALUE false
+#endif
 VARCACHE_PREF(
   "dom.security.featurePolicy.enabled",
    dom_security_featurePolicy_enabled,
-  bool, false
+  bool, PREF_VALUE
 )
+#undef PREF_VALUE
 
 //---------------------------------------------------------------------------
 // End of prefs
diff --git a/testing/web-platform/meta/wake-lock/wakelock-enabled-by-feature-policy-attribute-redirect-on-load.https.sub.html.ini b/testing/web-platform/meta/wake-lock/wakelock-enabled-by-feature-policy-attribute-redirect-on-load.https.sub.html.ini
index 8cfb38ba8dbc..17ce932f18e5 100644
--- a/testing/web-platform/meta/wake-lock/wakelock-enabled-by-feature-policy-attribute-redirect-on-load.https.sub.html.ini
+++ b/testing/web-platform/meta/wake-lock/wakelock-enabled-by-feature-policy-attribute-redirect-on-load.https.sub.html.ini
@@ -2,6 +2,3 @@
   [Feature-Policy allow="wake-lock" allows same-origin relocation]
     expected: FAIL
 
-  [Feature-Policy allow="wake-lock" disallows cross-origin relocation]
-    expected: FAIL
-
diff --git a/testing/web-platform/meta/webusb/usb-allowed-by-feature-policy-attribute-redirect-on-load.https.sub.html.ini b/testing/web-platform/meta/webusb/usb-allowed-by-feature-policy-attribute-redirect-on-load.https.sub.html.ini
index 7ddb197b51c5..f7ad77f77b5a 100644
--- a/testing/web-platform/meta/webusb/usb-allowed-by-feature-policy-attribute-redirect-on-load.https.sub.html.ini
+++ b/testing/web-platform/meta/webusb/usb-allowed-by-feature-policy-attribute-redirect-on-load.https.sub.html.ini
@@ -1,13 +1,11 @@
 [usb-allowed-by-feature-policy-attribute-redirect-on-load.https.sub.html]
+  expected: TIMEOUT
   [Feature-Policy allow="usb" allows same-origin relocation.]
     expected: FAIL
 
-  [Feature-Policy allow="usb" disallows cross-origin relocation.]
-    expected: FAIL
-
   [Feature-Policy allow="usb" allows workers in same-origin relocation.]
-    expected: FAIL
+    expected: TIMEOUT
 
   [Feature-Policy allow="usb" disallows workers in cross-origin relocation.]
-    expected: FAIL
+    expected: TIMEOUT
 
diff --git a/testing/web-platform/meta/webusb/usb-allowed-by-feature-policy-attribute.https.sub.html.ini b/testing/web-platform/meta/webusb/usb-allowed-by-feature-policy-attribute.https.sub.html.ini
index ce466c0f3be8..a8ee88b399d2 100644
--- a/testing/web-platform/meta/webusb/usb-allowed-by-feature-policy-attribute.https.sub.html.ini
+++ b/testing/web-platform/meta/webusb/usb-allowed-by-feature-policy-attribute.https.sub.html.ini
@@ -1,4 +1,5 @@
 [usb-allowed-by-feature-policy-attribute.https.sub.html]
+  expected: TIMEOUT
   [Feature policy "usb" can be enabled in cross-origin iframes using "allowed" attribute.]
     expected: FAIL
 
@@ -9,10 +10,10 @@
     expected: FAIL
 
   [Feature policy "usb" can be enabled in a worker in same-origin iframe using allow="usb" attribute]
-    expected: FAIL
+    expected: TIMEOUT
 
   [Feature policy "usb" can be enabled in a worker in cross-origin iframe using allow="usb" attribute]
-    expected: FAIL
+    expected: TIMEOUT
 
   [Inherited header feature policy allows dedicated workers.]
     expected: FAIL